Thermal Shadow

Thermal Shadow

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Credit: GIPHOTOSTOCK/SCIENCE PHOTO LIBRARY

Caption: A man's foot was placed flat on a wooden surface for about 30 seconds. After the foot was removed, the surface remained warmer than its surroundings and kept the thermal imprint, or shadow, for some time. Thermography is a technique for visualizing the temperature of objects by recording the thermal emission at infrared wavelengths. This image was acquired with a specialized camera that uses a focal-plane array of vanadium oxide microbolometers as a sensor. It is sensitive to electromagnetic radiation in the wavelength range of 8 to 14 micron. The camera produces a 320x240-pixel image where different colours correspond to different temperatures.

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Keywords: digital infrared thermal imaging, electromagnetic radiation, foot, foot print, footprint, heat, heat radiation, imaging, imprint, infrared, ir, radiation, science, technology, temperature, thermal, thermal radiation, thermal shadow, thermogram, thermograph, thermography, trace

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